Cantharimides: A new class of modified cantharidin analogues inhibiting protein phosphatases 1 and 2A
作者:Adam McCluskey、Cecilia Walkom、Michael C Bowyer、Stephen P Ackland、Emma Gardiner、Jennette A Sakoff
DOI:10.1016/s0960-894x(01)00594-7
日期:2001.11
Cantharidin and its analogues have been of considerable interest as potent inhibitors of the serine/threonine protein phosphatases 1 and 2A (PP1 and PP2A). However, limited modifications to the parent compounds is tolerated. As part of an ongoing study we have developed a new series of cantharidin analogues, the cantharimides. Inhibition studies indicate that cantharimides possessing a D- or L-histidine, are more potent inhibitors of PP1 and PP2A (PP1 IC50 = 3.22 +/- 0.7 muM; PP2A IC50 = 0.81 +/- 0.1 muM and PP1 IC50 = 2.82 +/- 0.6 muM; PP2A IC50 = 1.35 +/- 0.3 muM, respectively) than norcantharidin (PP1 IC50 = 5.31 +/- 0.76 muM; PP2A IC50 = 2.9 +/- 1.04 muM) and essentially equipotent with cantharidin (PP1 IC50 = 3.6 +/- 0.42 muM; PP2A IC50 = 0.36 +/- 0.08 muM). Cantharimides with non-polar or acidic amino acid residues are only poor inhibitors of PP1 and PP2A. (C) 2001 Elsevier Science Ltd. All rights reserved.